Open a vncviewer on your laptop and fill the ip address of collabn1 followed by :1.

On OS X and Linux you can use X11 forwarding instead of VNC. To do that, use the -X flag with your ssh command as in ssh -X -l oracle 192.168.78.51. If you are using Mountain Lion or later, you may have to install XQuartz first as described at http://support.apple.com/kb/HT5293

On OS X vi /etc/sshd_config change X11Forwarding yes

Enter the password racattack when prompted:

The graphical interface is ready for the Grid Infrastructure Installation.